common: Move exit related functions to common/exit

This patch series moves all the exit related functions to a separate file - common/exit. This will remove the dependency to source non-related files to use these exit related functions. Thanks to Dave for suggesting this[1]. The second patch replaces exit with _exit in check file - I missed replacing them in [2].

[v2] -> v3
Addressed Dave's feedbacks.
In patch [1/2]
- Removed _die() and die_now() from common/exit
- Replaced die_now() with _fatal in common/punch
- Removed sourcing of common/exit and common/test_names from common/config and moved them to the beginning of check.
- Added sourcing of common/test_names in _begin_fstest() since common/config is no more sourcing common/test_names.
- Added a blank line in _begin_fstest() after sourcing common/{exit,test_names}
In patch [2/2]
- Replaced "_exit 1" with _fatal and "echo <error message>; _exit 1" with _fatal <error message>.
- Reverted to "exit \$status" in the trap handler registration in check - just to make it more obvious to the reader that we are capturing $status as the final exit value.

[v1] https://lore.kernel.org/all/[email protected]/
[v2] https://lore.kernel.org/all/[email protected]/
[1] https://lore.kernel.org/all/[email protected]/
[2] https://lore.kernel.org/all/48dacdf636be19ae8bff66cc3852d27e28030613.1744181682.git.nirjhar.roy.lists@gmail.com/

Nirjhar Roy (IBM) (2):
common: Move exit related functions to a common/exit
check: Replace exit with _fatal and _exit in check

 check           | 54 ++++++++++++++++++-------------------------------
 common/config   | 17 ----------------
 common/exit     | 39 +++++++++++++++++++++++++++++++++++
 common/preamble |  3 +++
 common/punch    | 39 ++++++++++++++++-------------------
 common/rc       | 28 -------------------------
 6 files changed, 79 insertions(+), 101 deletions(-)
 create mode 100644 common/exit

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2.34.1